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centrolinead
centrolinead n. 
/ˌsɛntroʊˈlɪniəd/ now historical and rare an instrument used to facilitate the drawing of lines in a perspective drawing, consisting of three rulers joined together in such a way that the centrally located ruler, along which lines are to be drawn, may be orientated correctly by adjusting the position of the other two.
Brit. /ˌsɛntrə(ʊ)ˈlɪnɪad/
, /ˌsɛntrə(ʊ)ˈlɪnɪad/U.S. /ˌsɛntroʊˈlɪniˌæd/
, /ˌsɛntroʊˈlɪniˌæd//ˌsɛntroʊˈlɪniəd/ΚΠ
1814 P. Nicholson in Trans. Soc. Arts 32 67 An instrument of my invention called a centro-linead, for drawing lines to inaccessible vanishing points in perspective.
1901 Surveyor (Inst. Surveyors, New S. Wales) 15 Oct. 98 With the aid of such instruments as the perspectograph, centrolinead, and perspectometer, a great many points can be located in a short time.
1982 Math. Gaz. 66 205 Soon afterwards they [sc. the Society of Arts] awarded him [sc. Peter Nicholson] twenty guineas and later their silver medal for his invention of the centrolinead.
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